Madhusudan Dasxdev.hashnode.dev·Sep 27, 2023Difference Between undeclared, undefined, and nullUndeclared Variable: An undeclared variable is one that has not been declared in the current scope. Attempting to access an undeclared variable will result in a ReferenceError. Example: console.log(brain); // ReferenceError: brain is no...Discussundefined
Bartosz Szłapakbarcioch.pro·Sep 22, 2023Null, nullish, nullableIn most programming languages there is only one way of defining whether the value is set or not. That value is generally considered null but named differently. But the Javascript went one step further and introduced two of them: null and undefined. U...Discuss·40 readsNull
Ya Chuyachuh.hashnode.dev·Sep 19, 2023JavaScript - Null, undefined, not defined 差異Null, undefined, not defined 差異 null 與 undefined 差異 null 代表「空值」（有被賦予為空的值），轉為數值時為 0；undefined 代表「未定義」的原始值（尚未被賦予值），轉為數值時為 NaN undefined 與 not defined 差異 undefined 是變數被宣告了但沒有賦值，屬於原始型別之一；not defined 是變數沒有被宣告，不屬於原始型別，是執行程式時的錯誤訊息 (runtime error)，需要被修正。 con...DiscussJavaScriptJavaScript
Sameer Utradhiconsissamsy.hashnode.dev·Sep 15, 2023Undefined Vs Null in JSundefined: absence of evidence null: evidence of absence Source: https://twitter.com/ViliamKopecky/status/1702427073024057663Discussjs
Sama Mamdouhfrontendstudio.hashnode.dev·Sep 5, 2023Understanding the Difference Between 'undefined' and 'null' in JavaScriptIntroduction: JavaScript, being a dynamically typed language, has its ways of representing the absence of a value. The two primary values used in such cases are 'undefined' and 'null'. Despite often being used interchangeably, these two values have d...Discuss·27 readsNull
Ismail Adeshola Ogundeleislot.hashnode.dev·Aug 16, 2023Null and Undefined in JavaScript.Introduction JavaScript has emerged as one of the leading programming languages, particularly in the realm of software engineering and web development. Despite its straightforward syntax and simplicity, beginners often encounter challenges when grasp...Discuss·1 like·73 readsJavaScript
The Analyst Geektheanalystgeek.hashnode.dev·Aug 3, 2023How to Handle Null Values in SQLUnderstanding Null Values in SQL In SQL, a null value represents the absence of a value for a specific data field. It is not the same as zero or an empty string; rather, it signifies that the data is unknown or not applicable. It's important to recog...Discuss·33 readsNull
Dhawal Pandyadhawalpandya01.hashnode.dev·Jun 16, 2023Zero Types and Nil in GolangGo is Golang, btw. So in Go, zero values are the default values assigned to variables of a particular type when they are declared but not explicitly initialized. The concept The concept of zero values is important in Go because it ensures that variab...Discuss·75 readsgolang
Mariagoretti Kimanimariagoretti.hashnode.dev·Jun 5, 2023Null,empty and blank .Null indicates there is no value at all within a database field for a given record. It does not mean or represent zero, because zero is a value. Null is simply the word used to show the absence of any data in that field. The code String nullString = ...Discuss·1 likeNull
Maxi Contierimaximilianocontieri.com·May 13, 2023Code Smell 212 - Elvis OperatorYour code is not safer using this operator TL;DR: Don't propagate nulls. Problems NULL propagation Harder to read code Hacky code Solutions Remove the nulls. If you can't remove it, deal explicitly with them. Context The Elvis operator is...Discuss·215 readsCode SmellsGeneral Programming
